My 250gb xbox is laying flat (NOT VERTICAL) and makes the loudest noises when trying to play any game that is not installed to the hard drive. Also when I put Forza 3 into the xbox I heard a grinding noise and I'm pretty sure the disc is scratched. The xbox is in an open area and nothing is touching or moving it. Is this enough concern to call microsoft and have them take a look at it or replace the console? I want to be able to put a disc into the xbox and not bust my eardrum.